Door-lock.



G. SAHMER.

DOOR LOGK.

APPLICATION FILED OUT. 5, 1911.

Patented Sept. 17,1912;

A device for lockin TED STATES PATENT ornion GUSTAV SAHMER, 0F STRASSBURG, GERMANY.

DOOR-LOCK.

Specification of Letters Patent.

Patented Sept. 17, 1912.

Application filed October 5, 1911. Serial No. 652,898.

To all whom it may concern:

Be it known that I, GUSTAV SAHMER, a subject of the German Emperor, and residing at Strassburg, Alsace-Lorraine, German Emplre, have invented certain new and use-- ful Improvements in Door-Locks, of WlllCh the following is a specification.

The present invention has reference to improvements in door locks, and relates more specifically to an electrically operatedv and freeing respectively the latch bolt of oor locks, and the particular object of the invention is to provide means in connection with such electrically controlled door locks whereby the lock-bar is mechanically secured in either end posi-I tion, and is so constructed that a bending or breaking of it, upon the latch bolt encountering it in the locked position, is effectively prevented.

In order to make my invention more read ily understood, I will now describe it with reference to the accompanying drawing, in

- which- Figure 1 represents a side elevation of the device, with but part of the latch bolt and.

its casing; Fig. 2 shows a section on line AB of Fig. 1; Fig. 3 shows a front view,

'with the front wall of the box removed;

Fig. 4 shows more diagrammatically a modified construction with yielding lock-bar; Fig. 5 represents a diagram of the circuit connections suitable in using the improved device.

WVithin the box 1 are secured in the support 2 the iron cores 3, 4 with their insu- -lated'wire coils5, 6, whose outer wire ends 2, and is secured to the lock-bar 16, which latter can reciprocate in the support 2 and also in a guide plate 17, preferably stamped out of the wall of the box and bent rectangularly thereto, which plate also serves as protecting shield for the operating parts. Upon a second rod 18, secured in the supporting frame 2, is pivoted by means of the,

sleeve 19,. or in any othersuitable manner, a rock ng armature which is acted on by the spr ng 20. This armature, in the shape of a bell-crank, partly surrounds with its a forked arm 21 (Figs. 2 and 3) the cores 3, 1-,

and with, itsother arm22 takes into two notches 23 in the lock-bar 16, spaced apart to correspond to the two respective end positions of the lock-bar. Y

In order to prevent bending or breaking of the head of the reciprocating lock-bar upon the bolt 24 being shot and the lock-bar being already'in the locked position, its

side facing the bolt and the lower front edge of the bolt are rounded off, as shown in the modified form of the describeddevice as illustrated in Fig. 4, and the bar itself is composed of two relatively movable parts, the tubular member 25 and the lockingmember proper 27 guided therein and acted on by the spring 26. Suitable means, for

instance a slot and pin arrangement as at.

35, prevent rotation of the lock bar. The reduced end 28 of the locking member 27 is guided inthe support 2, and the armature 14 is rigidly secured to the tubular member 25. Upon the bolt striking the projecting lock-bar head the rounded-off faces easily glide over one another, the locking member readily receding under compression of the interposed spring 26, until the bore 36 in the bolt registers with the lock-bar head,

when the latter under the action of the spring is forced forward into the bore and thus locks the bolt against inadvertent withdrawal. In this modified construction there 23 above described with reference to Figs.

'1 and 2, and which cooperates with the arm 22 of'the rocking armature'for the purpose of securing the lock-bar in the respective end;

position.

'I will now describe the operation of the device in connection with the diagram shown in Fig. 5. The two-way switch 30 with its contacts a and b is connected-upr respectively to the coils 5, 6, and its contact 0 to the battery 31 and the latter in turn to the commonter'minal'13. By operating the switch, either one of the electromaguets 3, 4

is shown a flange 29 on the tubular member which fulfils the same oflice as the notchesQO may be, energized and the armatur cone,

is to be closed over 30", when the coil (his.

excited and itscore-a attracts the armature, causing the latters headlto free the bolt 24. Simultaneously with the armature 1 1' the forked end 21 of the rocking armature isat tracted, its other end 22 being lifted out of the respective notch 23 in the lockbar. Upon interruption of the current the spring presses thearmat-ure end '22 back again into the other notch, whereby the lock-bar is again secured in 'the'respective new end position. a

,In the modified construction shown in Fig. 4, the operation is similar ,tothat just described, the arm 22 of the rocking armature taking over or under the flange 29 of the tubular member 25, as the case maybe.

In the circuit illustrated in Fig. 5 there are further cut-in the two-way switch 32,

ing a reciprocating bolt, of coaxially disthe door contact 33, and the loose key switch 34 Now suppose the 'doorbolt 24 is to be locked automatically upon thedoorbeing shut on going out or coming in, without the switch being operated in any way, and the locking devicebeing in the open position; then the switch lever=S of switch 32, which ordinarily is in the inactive position shown, is to be laid onto contactd,

. when, upon the door operating the door contact 33, the current will pass through 7 line V, over the contact member 33, of the 40 door contact, through line VI and post 9 to the upper coil 5,through post 13, line II, battery 31, line III, and back to switch 32, which completes the circuit. The coil 5 attracts the armature and the lock bar 16 enters the recess in the bolt 24-and thereby locks the latter. Suppose now that the person going out or wanting to enter the door has no access to the switch 30, then it would be impossible to operate the de therefore-necessary to connect-1n the loose key switch 34. The person going out must connect the lever S with contact 6 whereby the'switch 34: is cut into the main circuit. 'Upon insertingthe key into the rotary part 34, of the switch and turning it, the contact member f is lifted and contacts with the rigid contact member g, so that the cur rent now passes from post 6, through lines VII and VIII to the lowercoil 6, middle of the switch 32 are interconnected for the tion.

vice for locking and unlocking, and it is post 13, lineII, battery 31, line III back purpose that the contact 33 and the loose key switch may" respectively operate, no matter what the contacting position of the lever S. Obviously, thetwo-way switch 30 can be operated at anytime, independently of any position or operation of the auxiliary devices'describedj The operation of the device for freeing the lock-bolt may also be .brought about mechanically by providing push button 37 in connection with the box (Fig. 2) operable from without, which acts on the rocking armature so as to lift its arm 22 out of the lower notch or from under the flange 29 of the lock-bar, when the'latter will drop down by its own weigh and release the bolt. (hat I claim is r I V 1 1. The combination with a lock comprising a reciprocating bolt, ofa' lock bar, coaxially arranged electromagnets, an armature thereto, secured to said lock bar and adapted to move said lock bar into or out of cooperation with said bolt, and electromagnetically controlled means for securing said lock bar in either operative end position;

2. The combination with a lock comprisposedelectromagnets, a reciprocating armature thereto operating between sald electromagnets and ax ally thereof, a lock bar operated by said armature and cooperating with said reciprocating bolt in the one end position, and electromagnetically controlled means for securing said lock bar in either end position;

3. The combination with a lock comprising a reciprocating bolt, of coaxially dis-' posed electromagnets,a reciprocating armature thereto operating axially thereof, a lock bar operated by said armature and cooperating with said reciprocating bolt, and a rocking armature operated by said electromagnets and cooperating with said lock bar for securing it ineitheroperative end posi-' 4. The combination with a lock comprising a reciprocating bolt, of a lock bar, stop means thereon, electroinagnets coaxially spaced apart, a reciprocating armature actuated by said electromagnets and secured to said lock bar, means for securing said lock bar against inadvertent operationconsisting of a spring actuated rocking armature operated 'by said electromagnets and cooperating with said stop means on said lock bar, and means adapted to cause part of the lock bar to recede to its unlockingposition when the bolt is shot withthe lock bar in the locking position.

5. The combination with a lock comprising a reciprocating bolt, of a lock bar, stop means thereon, electromagnets coaxially' spaced apart, a reciprocating armature 'actuated bysaid electromagnets and, secured 130 GUSTAV SAHMER.

to said lock bar, electrically controlled means for securing said lock bar against inadvertent operation consisting of a springactuated rocking armature operated by sa1d electromagnets and cooperating with said stop means on said lock bar, and manually operable means for actuating said rocking armature independently of the electrical Witnesses:

JOSEPH ROHMER, AUGUST OOSTERMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

